Agincourt Gaming, a Texas-based gaming company, has sued Zynga for patent infringement, Inc. reports. Agincourt is seeking unspecified monetary damages and has requested a permanent injunction against Zynga that threatens to shut down its popular Facebook games.

Agincourt says it owns “foundational patents that claim priority back to 1996,” including concepts like a rewards system that allows users to earn credits and redeem them for prizes—one of the most significant (and lucrative) features of Zynga’s games.

Agincourt Gaming, a Texas-based gaming company, has sued Zynga for patent infringement, Inc. reports. Agincourt is seeking unspecified monetary damages and has requested a permanent injunction against Zynga that threatens to shut down its popular Facebook games.

Agincourt says it owns “foundational patents that claim priority back to 1996,” including concepts like a rewards system that allows users to earn credits and redeem them for prizes—one of the most significant (and lucrative) features of Zynga’s games.